root,roofit: bump version; fix relocation

Hash: fcbff75adee4d709b251c0e57e63bc08e37e65ce

Use ROOT_INCLUDE_PATH during compilation and installation steps.

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge branch 'IB/CMSSW_7_1_X/root6' of github.com:cms-sw/cmsdist into IB/CMSSW_7_1_X/root6